The short version
Mould is a moisture problem. Remove surface growth in the joints with a targeted product (chlorine-based strong, chlorine-free gentler), with gloves, goggles and good ventilation. What keeps it from returning is not the cleaning but the cause: less moisture in the air.
Black dots in the silicone joints, a musty smell in the corner behind the laundry basket: mould in the bathroom is common, because warmth and moisture meet there. Wipe it away only and it usually returns soon. Tackle the cause and you are rid of it for good.
Important up front: this is about small, surface growth in joints and on silicone. Large-area mould, or mould coming out of the wall, belongs in expert hands.
Why mould forms
Mould spores are everywhere in the air, but they only germinate where it stays damp. In the bathroom those are the classic spots: silicone joints at the shower and tub, cool outside walls, poorly ventilated corners. After showering the damp air lingers, settles on the coldest surfaces and gives mould what it needs. That is why dry, well-aired air is the most effective prevention.
Removing growth, step by step
Protect & ventilate
Gloves and goggles on, window open. With anti-mould products ensure good ventilation, the fumes are irritating.
Apply the product
Apply a targeted product to the affected joint. Chlorine-based works strongly, chlorine-free is gentler, both per the instructions.
Wipe off damp
Wipe off with a damp cloth, do not brush dry. Dry scrubbing stirs up spores.
Dry
Dry the spot well and keep it dry. If mould sits deep in the silicone, only renewing the joint helps.
So the mould does not come back
- After showering, briefly squeegee the walls and air out fully instead of just tilting the window.
- Air across several times a day, especially in winter when the walls are cold.
- Wipe joints and silicone dry after showering, especially in the corners.
- Do not dry wet towels in the bathroom, it keeps the humidity high.
- Keep furniture a little away from cool outside walls so air can circulate.
When it is a job for professionals
Large-area mould, growth behind tiles or out of the wall, and mould that keeps returning despite good ventilation point to a structural moisture problem. That needs a professional assessment. And do not confuse them: against limescale you need acid, against mould a different product.
Choosing the right product
Depending on the growth and your sensitivity there are two routes. What to look for:
- Chlorine-based: very strong on stubborn black mould, ventilate well
- Chlorine-free: gentler, more pleasant smell, for lighter growth
- Always use with gloves and goggles
Frequently asked
Does vinegar help against mould?
Is chlorine-based mould remover dangerous?
Why does the mould keep coming back?
Can I save mouldy silicone?
Take on the bathroom
From limescale to mould, we show the right product for every problem.
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